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  1. #define CHECKABLE_TYPEDEF(Name) \
  2.     template <typename T> \
  3.     struct HasTypedef_##Name { \
  4.         typedef char yes[1]; \
  5.         typedef char no[2]; \
  6.         template <typename C> static yes& test(typename C::Name*); \
  7.         template <typename> static no& test(...); \
  8.         static const bool value = sizeof(test<T>(0)) == sizeof(yes);\
  9.     };
  10.  
  11.  
  12. #define HAS_TYPEDEF(Type, Name) HasTypedef_##Name<Type>::value
  13.  
  14.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
/usr/lib/gcc/i686-pc-linux-gnu/4.5.1/../../../crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/PaXW7
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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